Remove the following redirect chain

It seems that my web site is redirecting to unwanted places which slows down my web site.
I have tried deactivating all plugins but the problem remains.
The problem is that i have no idea where to find and erase these redirects

This is what pingdom says:

Remove the following redirect chain if possible:
http://ad.crwdcntrl.net/5/c=10546/pe=y?http%3A% … NS4wMDA1NzY1Ni0wNTowMCJ9%26sg%3D%24%7Baud_ids%7D
http://mt.rtmark.net/ltm.gif?id=pu_eyJ1IjoiMWY0 … Ny0wOS0yN1QwODozMToxNS4wMDA1NzY1Ni0wNTowMCJ9&sg=
Remove the following redirect chain if possible:
http://go.mobisla.com/notice.php?p=1399567&interactive=1&pushup=1
http://go.pushnative.com/notice.php?p=1399567&interactive=1&pushup=1
Remove the following redirect chain if possible:
http://go.pub2srv.com/apu.php?zoneid=1399564
http://onclkds.com/apu.php?zoneid=1399564
MORE AT GOOGLE DEVELOPERS

Would you know how to erase these redirects?

Hi There,

Thank you for writing in, that seems to be some advertising link. Please remove any scripts you have and plugins that has something to do with advertisement. If you don’t have any of that (advertising scripts/plugins) please contact your host where its coming from as that links are definitely not coming from the theme.

Have a nice day,
Cheers!

Actually I have tried to activate plugins one by one to see which one was causing the issue.
and it turns out that when i activate Cornerstone. These warning come:

Remove the following redirect chain if possible:
http://go.mobisla.com/notice.php?p=1399567&interactive=1&pushup=1
http://go.pushnative.com/notice.php?p=1399567&interactive=1&pushup=1
Remove the following redirect chain if possible:
http://go.pub2srv.com/apu.php?zoneid=1399564
http://onclkds.com/apu.php?zoneid=1399564

It seems cornerstone has been infected in some way

Hi There,

In that case, please try delete current Cornerstone plugin. Then visit X homepage so it will be automatically installed again. Note to always save a backup of your site.